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. 1985 May;82(10):3320–3324. doi: 10.1073/pnas.82.10.3320

Developmentally regulated expression of the bean β-phaseolin gene in tobacco seed

Champa Sengupta-Gopalan 1, Nancy A Reichert 1, Richard F Barker 1,*, Timothy C Hall 1,†, John D Kemp 1
PMCID: PMC397767  PMID: 16578787

Abstract

Recombinant phage λ177.4 contains a gene for β phaseolin, a major storage glycoprotein of French bean seed. A 3.8-kilobase Bgl II-BamHI fragment containing the entire 1700-base-pair coding region, together with 863 base pairs of 5′ and 1226 base pairs of 3′ flanking sequence, was inserted into the A66 Ti plasmid of Agrobacterium tumefaciens and used to transform tobacco. The level of phaseolin in the seeds of plants regenerated from cloned tissue was 1000-fold higher than in other tissues. The molecular weight of the phaseolin RNA transcript in tobacco seeds was identical to that found in bean seeds. The phaseolin protein in tobacco seed was glycosylated and appeared to undergo removal of the signal peptide. However, a large proportion of the phaseolin was cleaved into discrete peptides. These same peptides were formed as phaseolin was degraded during tobacco seed germination. The phaseolin gene appeared to be inserted as a single copy, and the proportion of phaseolin per genome copy in tobacco seeds (up to 3% of the total embryo proteins) resembled that in the bean seeds (40% of total seed protein, expressed from about 14 copies per diploid genome). Furthermore, the transplanted gene was turned on during tobacco seed development, and its protein product, phaseolin, was localized in the embryonic tissues. Finally, the phaseolin gene was inherited as a Mendelian dominant trait in tobacco.

Keywords: foreign gene expression, Mendelian segregation, electrophoretic immunoblot analysis

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Selected References

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